max5440eagt Maxim Integrated Products, Inc., max5440eagt Datasheet - Page 9

• Manufacturer Part Number: max5440eagt
• Description: Max5440 Stereo Volume Control With Rotary Encoder Interface
• Manufacturer: Maxim Integrated Products, Inc.

Table 1. Wiper Position and Attenuation
Figure 3. Balance-Control Operation
H_
L_
H_
L_
POSITION
32 (MUTE)
6 (POR)
…
…
30
31
0
1
2
_______________________________________________________________________________________
W0
VOLUME LEVEL IS SET BY W0
W0
VOLUME LEVEL IS SET
ATTENUATION (dB)
W1
W1
≥ 90
-12
-60
-62
…
…
-2
-4
ROTATE CW
ROTATE CW
0
with Rotary Encoder Interface
ONCE
ONCE
W0
W0
In balance-control mode, the MAX5440 adjusts the bal-
ance between channel 0 and channel 1 while maintain-
ing the set volume. For example, if the volume of
channel 0 equals the volume of channel 1, forcing the
balance towards channel 1 increases the attenuation of
channel 0 (Figure 3a). If channel 1 is at a higher attenu-
ation than channel 0, adjusting the balance to channel
1 moves channel 1’s wiper up to the same wiper posi-
tion as channel 0 before it was attenuated (Figure 3b).
The click-and-pop suppression feature reduces the
audible noise (clicks and pops) that results from wiper
transitions. The MAX5440 minimizes this noise by allow-
ing the wiper to change position only when V
Each wiper has its own suppression and timeout cir-
cuitry. The MAX5440 changes wiper position when V
= V
4a and 4b).
The suppression circuitry monitors left and right chan-
nels separately. In volume-control mode, when the first
wiper changes position, the second wiper has 32ms to
change or it will be forced to change.
Stereo Volume Control
L
, or after 32ms, whichever occurs first (see Figures
W1
W1
ROTATE CW
ROTATE CW
ONCE
ONCE
Click-and-Pop Suppression
W0
W0
VOLUME LEVEL MAINTAINED
VOLUME LEVEL MAINTAINED
BALANCE SHIFTS TO W1
BALANCE SHIFTS TO W1
Balance Control
W1
W1
H
= V
L
9
H
.